ML20101C845
| ML20101C845 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/03/1980 |
| From: | Mancinelli J GENERAL PUBLIC UTILITIES CORP. |
| To: | Koltay P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20101C806 | List: |
| References | |
| NUDOCS 8412210219 | |
| Download: ML20101C845 (2) | |
Text
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. ATTACHMENT 1 J;rssy Centr:I Pcw2r & Light Company
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Macison Avenue a: Punct. Bout Road p
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Momstown. New Jersey 07963 (201)455-8200, March 3,1980 s
Mr. Peter Koltay Huclear Regulatory Commission 631 Park Ave.
King of Prussia, PA 19406
Dear Mr. Koltay:
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SUBJECT:
4160 Volt Fire Protection Vault
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'7 Please~ find the following-documents and dradin'gs that you requested
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concerning the 4160 volt switchgear vault:
1.
System description for 4160 volt Switchgear Ro'om; 218-77-18.1, Rev. 1.
2.
Safety evaluation for the Fire Protection System Augmentation 4160 volt switchgear vault, 218-77-18.2 Rev. O.
3.
Design criteria 218-77-38, Rev. O.
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Installation Specification, 218-77-45, Rev. 2.
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Installation Specification, 218-77-61, Rev.1.
6.
GPU drawings E-1-110-313-001, Rev.1; E-1-110-313-002, Rev.1, and E-1-110-313-003, Rev.1.
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Marine Fabricators drawings Job #26465 101 thru 110 Rev. 2.
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Bowman Construction drawings, 28555, Sheets 1, 2, and 3 dated 12-20-79.
Please be advised that some of your concerns regarding the 4160 volt vault have been<previously addressed in the following letters:-
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DR PDR O
i Jefiey Ct".:rs' Power 6 L g-* C,ompany is a fJe noer o'14 General Puba: Uv.1.es Systern
a.
Ivan Finfrock to the Director, NRC, dated March 23,1978; t
b.
Ivan Finfrock to the Director, NRC, dated June 1,1979.
In addition, all fire protection modifications have been reviewed in detail and approved by JCP&L's Fire Protection Consultant, Professional Loss Control Inc.
With respect to the exterior walls of the vault, they have been designed to provide a three-hour fire barrier to protect the switchgear from the lube oil fire hazard. This has been accomplished by a coating of fire retardant material applied to the exterior surfaces of the vault walls and ceiling.
Manufacturer's test data, based upon ASTM E-119 testing, indicates that a two inch coating on. Walls and decks is the required thickness needed to. provide a three-hour fire barrier..
Any fire originating inside the vault will be of short duration due to the low fire loading, the detection system, and the nanual CO.
For this 2
reason, the interior wall separating the redundant switchgear is a two-hour fire barr.ier by designet-In actuality, however.. -the' fire rating is probably much. greater..tt'Detai:1. A on GPUSC drawing E,1_110-313-001 shows..the interior.
det <ing :or wallccovered on each side with-lath and:1-11'/.16""of Pyrocrete:102.~.0
-In cordance with the.manu#acturer's-test ' data',xthis would be equivalent'.to a two-hour barrier on each side of the ~ interior wall. ~,
Concerning the seismic adequacy of Pyrocrete, manufacturer's test data indicates excellent adhesion and minor indentation without cracking resulting from impact testing, as compared with poured in-place concrete.
If you have any further questions,.please contact me.
Very truly yours, f
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~ J. F. Mancinelli lab 6
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